Water-tube boiler.



N0. 7:6,032, Patented'Dec. I6, I902.

R. HANSON. n. HENSHALL& A. E. BOAHDMAN.

WATER TUBE BOILER.

\Applicatipn filed Mar. 31, 1902) (No Modei.)' 3 Sheets-Sheet l.

m: NoRms Panes co. mom-1mm, WASHINGTON, n, c.

Patented Dec. I6, I902. RrH'AN'SONfR. HENSHALL 81. A. E. BOABDMAN..

WATER TUBE BUIEER.

(Application filed Mar. 31, 1902.)

3 Sheets-Sheet 2.

(No Model.)

d "ix IS Pznlns co. Pgwnruvna, WASNINGYON, u c

Patented Dec. l6, I902. ARDMAN.

-R. HANSON, n. HENSHALL & A. E. 80

WATER TUBE BOILER.

;Applicatiou filed Mar. 31, 1902) 3 Sheets-Sheet 3.

(No Model.)

THE News PETERs co, mow-umo wAsmNmom u c.

name Srarns Barrens OFFICE,

ROBERT HANSON, ROBERT HENSHALL, AND ARTHUR EDWIN BOARDMAN, OF WARRINGTON, ENGLAND.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters P atent No. 716,032, dated December 16, 1902.

Application filed March 31, 1902. Serial No. 100,768. (No model.)

To all whom it may concern:

Be it known that we, ROBERT HANSON, boiler-maker, residing at' 33 Willis street, ROBERT HENSHALL, provision merchant, re-

- siding at The Old Vicarage, Knutsford road, and ARTHUR EDWIN BOARDMAN, engineer, residing at 78 Manchester road, Warrington, in the county of Lancaster, England, subjects of the King of Great Britain and Ireland, have invented certain new and useful Improvements in VVater-Tube Boilers, (for which we have made application for Letters Patent in Great Britain No. 21,753, bearing date October 29, 1901,) of which the following is a speci- I5 fication.

This invention relates to water-tube boilers, the object being to provide a boiler affording efEective circulation of water and efficient generation of steam with economy of fuel consumption, the construction of the boiler also admitting of free expansion and contraction of thetubes, and the boiler furthur, when necessary, eifecting a drying or superheating of the steam.

The invention consists in arranging two or more steam and Water drums above two or more water-drums between, but below whichlatter a set of fire-bars is disposed, and in connecting the upper drums to the lower, first, by groups of curved diagonal uptake water-tubes having the individual sets of each group alternating with each other, and, secondly, by curved lateral downtake watertubes, the upper drums being further connected by large tubes to a dry-steam drum or superheater, and the whole boiler we incl'ose" within a suitable casing provided with baffles in order to direct the gases of combustion, first, along a central inward flue among the 40 diagonal uptake-tubes; secondly, along in an outward direction among the lateral side or downtake-tubes, and, thirdly, returning in an inward direction along the lower side flues in contact with a portion of the lower drums to the chimney or uptake-shaft.

The accompanying drawings illustrate one convenient manner of carrying out the invention.

Figure 1 is a'front sectional elevation on B B of Fig. 2, which is a side sectional eleva- Fig. 3 is a sectional plan tion on A A, Fig. 1.

on O C, Fig. 1, the boiler being removed in order to show the fines.

' In carrying out the invention according to one modification and as illustrated in the drawings two steam and water drums at a are mounted above two lower water-drums b b. The drums coca are connected to the drums b b by groups 0 d of curved diagonal Watertubes, each set of tubes of one group alter- 6o nating with each set of the other, as shown in Figs. 1 and 2. The upper and lower drums are further connected by lateral groups of water-tubes e e.

An upper steam-drum g, communicating with the drums a a by one or more large tubes ff, serves as a dry-steam drum or superheater. The whole boiler thus formed is inclosed within a casing It, provided with fiues 7s 0, formed by suitable baffies or walls Z10. The furnace m is situated between but below the lower drums b b. The boiler is provided with blow-off pipes 11 t,which act as sedimentreceivers, and with the usual mountings, cocks, and other fittings. Afeed-water pipe at is led above the furnace, as shown, in order to heat the feed-water.

In operation the flames and gases of combustion passing inwardly and upwardly from the furnace m impinge upon the uptaketubes 0 d and drums a a, quickly heating the Water therein and setting up'a rapid circulation, which induces an extensive generation of steam. The combustion-gases then pass outwardly, as shown by the arrows 00, into the side fiues o, where they meet thelateral downtake-tubes e e, down which the cooler water circulates from the upper to the lower drums. From the fiues o the gases again pass inwardly, as shown by arrows y 'y, along the lower fines 70 k. in contact with the lower drums in b, finally making an exit by the chimney or uptake-fine j, as shown by the arrows z. By this arrangement of flues the heat of the combustion-gases is most effectively utilized.

By arranging that the tubes 0 at cross each other and alternate in the manner shown above the furnace we insure great heat being applied at this part, as the tubes thereby form a baffie. The tubes being curved provide for free expansion and contraction and by their crossingdiagonallyimmediatelyabove thefurnace enable the hot gases to impinge against their surfaces during the passage through the central flue, while the provision of the return-tubes e e at the sides insures a complete circulation. The curved form of the tubes enables the ends to be rigidly secured to the upper and lower drums, any expansive movement being taken up by the curved form. The tubes are all curved, preferably, to the same radius. The hot gases passing above the tubes 0 d impinge upon the drum g and dry or superheat the steam therein. hen it is not desired to superheat the steam, the drum 9 may be protected by a baffle or firebrick arch and then used simply as an ordinary collecting-drum.

It is to be understood that our invention is not confined to two upper and two lower drums, as any suitable number of these may be employed connected by tubes similarly to the manner hereinbefore described.

Having now described our invention, what we claim as new, and desire to secure byLetters Patent, is

In combination, a water-tube boiler com prising two upper steam and water drums and two lower water-drums, two groups of curved diagonal uptake Water-tubes connecting the upper drums to the lower, the individual sets of each group alternating, curved lateral downtake water-tubes connecting each upper drum to the lower drum immediately beneath, adry-steam drum or superheater connected to the upper drums by one or more large tubes and a set of fire-bars between but below the lower drums; and a boiler-setting comprising a casing h, bafiies Z, 19, separating the central flue from side fines 0, 0 and lower side flues 7t, 70 substantially as hereinbefore described with reference to the accompanying drawings.

In witness whereof we have hereunto set our hands in presence of two witnesses.

ROBERT HANSON.

ROBERT HENSHALL.

ARTHUR EDWIIX BOARDMAN. lVitnesses:

FREDERICK GEORGE TAYLOR,

0. JAMES HALL. 

